Valve mechanism.



H. A. HATFIELD.

VALVE MECHANISM.

APPLICATION FILED NOV. 2, 1914.

1,149,259. Patented Aug. 10, 1915.

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V i 1 n I device which can be. used in connection with v To all whom it may concern UNITED rAIE TO CEJ i HIRAM A. ATFIE D, or NOGALES, ARIZONA, ASSIGNOR, B'r MEsNE ASSIGNMENTS, 11o

. IN TIE RNJ-LTIONAL AIR-BRAKE: COM PANY, OF HWILMINGTO N, DELAWARE, A CORPO- RATIQN OF DELAWARE. I

'Be it known thatL HIRAM A JHATrIELn, a acitizen of the United statesfand aresident otNogales', inlthe county of Santa Cruz and State of Arizona have made certain new and useful Improvements inValve Mechanismsrof NVlllCll the fiollowmg 1s a "specification. g

My invention relatesin gen'eral to improvei'nents in .v'alve mechanlsms for fluid pressure brakesfsuchfl as are usually operlatedby compressed air, and it consists in the -co1nbinations, constructions, and er rangements herein described and clalmed. 02in object of my 1I1V6I1t101111S to provide a an automatic triple valvefor setting the "brakes withstraight air byapplying overcharge air pressure fromthe main reservoir *on'the engine tothe trainline air pressure connection through the I engineers brake valve.

I Another object of my invention is to pro vicle an improved apparatus of thetype de scribed which will act perfectly, regardless ofth'e weight or tonn'age of a caror the different train line pressures. I

Other objectsand advantages will appear in the following specificatio'nandthe novel features of the device-will be particularly pointed-out in'the appended claims. i j

In my 'prior applicationhled" July 27, 1914; Serial "#853,501 I have shown the cylindrical piston 'valv'e which admits the 7 air to the-brake cylinder-ina horizontal position' directly below the main valve chamhe, present inventionis' an impr v ment'oirthis valve in that the cylindrical piston valve 'is' placed :in "vertical position' at the side of the main valveywhich gives :a morei graduated 'controlfand the port throughthe piston valve perm ts t to 'return to its normal position by gravity.

I -Myfinvention is illustrated in theacconipanying drawing forming part of this application in which i i Figure l is" a diagrammatic plan "View showing the central vertical section through the device, Fig. 2 is a cross section View along thel1ne'2'2"of Flg. 1;

I ln'the following specification I will describe completelythe novel valve mechanism and the operation thereof, 1 and only :so muchof the ordinary mechanism which cooperates th'erewith as will be: sufficient cylindrical valve LVE iincrmivrsilr.

j Specification of Lettersfatent Patgnted Aug; 1915 Application fileii November 2, 191a Serial nesearss.

eration ofiny invention.

i In carryingoutmyflnvention I provide a valve casing 1 of] suitable shape.

port '5] whichisconnected with the auxiliary reservoir. Packingrings 6 are provided' for the weighted valve. A lower closure membere is designed to control aport 7 and apassage 18. "A r bypass isarranged inthe wall of the casing l fora purpose hereinafter explained. I

sides of the valve in thefauxiliary line is reduced to of'the excess air contained normal pressure. 1' the body portionl at the side of ch'amberfin,

which the "valve 4 operates is a cylindrical bore 9 in which is disposed acylind'rical valve piston 10. A passagplS communi cates with the lower portion of tlrievalVe I "In the present instance "Ihave shownfthis a provided at its upper T for a clear understanding of the use andop- I i w p p I A seepage groove- 22 connectsiw ththe top portion of bypass 8 to a I i allow aa gradual equalization on I opposite reservoir whenthe train I chamber in whichv'alvej 4L operates andthe cylindrical bore 9: A screw plug 11 is provided for iclosing'the endof the bore) The Valve 10'has a projecting portion 10 for limiting the movement of the valve toward the plug; At 12 is shown an exhaustfport. "A passage 13 communicates with the "in 'terior portion 9 ofthe bore atbotlrendsof piston. 10 andwithfi passage "The passage 14 in turn communicates with thefbrake cylinder either through: the

exhaust port of the triple valve l or canflbe connected direct byfithe use of a double check valve tocontrol both exhaust ports. f From the foregoing description of the'var rious parts ofthe device the operation thereof may be readily understood When an overcharge of air pressu'reis supplied 'to the train line through the engin'eers valve-"to*set the brake; passageflli' being connected directly tothe drainlplug Of the, automatic triple valve, air passes from the train line through the passage 17 andport 7 'whereit 'unseatsfthe; weighted *valve This allows the air to pass lower valve 'niember' PFthence by' 'niea ns of the passage 18 into" the bore 9; thus forcing "the V .vidua-l car.

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piston valve 10 to the projecting portion at-jthe top of bore 9. 'lhis uncovers the passage- 13 and'eovers the'e'xhau st port 12.

The -air now flows through thepa'ssage 13 and is delivered through passage 14 to the exhaust port of the triple valve and on -tothe brake cylinder, thereby setting orjapply- 'ing the brakes. It-will be understood that -gineer applies an overcharge of air pressure to the train linepressure. In order to set the brakes with automatic air as now used one of these improved straight. air valve mechanisms will be used in connection with the automatic triplevalve on each incli- -When the train lineair pressure is again .reduced to normal pressure-through the engineefsvalve, the weighted valve 4 seats on port 7 v and passage '18,.the vent '19 through cylindrical valve piston 10 permits it to fall to it's normal position whichthen opens :theex aust port 12 releasing air'from brake 20'; e the brake. 1

cylinder to the atmosphere, thus releasing,

. It Will'thusbe seen aependstntirelyonthe amount of overcharge air pres-.

sure which the engineeradds to the train lineair pressure how hard the brakes are set, as he has Complete control over this by the usegof the en gineers brake valve on 1 the engine, I

As. before 7 we straightair valve mechanism the brakes can be applied by both the use of stra ght a1r and automatic air. Straight air can be applied to the brakesand automatic air applied on top, w I pliedto .thebrakesand straight a1r can be f applied on top, but with my valve it is betor automatic aircan be apterl'to use straight air in all cases, thereby having the automatic a1r 1n, reserve incase ofaccident, such as the parting of a hose iconiie'cti'onl or the breaking ofa train'pipe. {As is clearly seen, the auxiliary freservoir {is kept -charged by theuseof my valve.

With the present system of automatic air .'brakesit often'happens on long grades that theautomatic air pressure contained in the auxiliary; reservoir. is not suiiicient to hold i eavyj trains when making continuous applications and having to bring the brakes tofullrelease before being ableto recharge the auxiliary reservoir, whereas by the use 'of. myvalve the engineer can apply the brakes by the use of the overcharge air pressure suflicient to, hold the train, and at the same time have the automatic a1r in reserve to set the brakes n case of accident as mentioned above. I

By he use of myvalve is impossible to loose the braking power since any position other than running and lap positions of the engineers brake valve will set the brakes.

Also' .by the. use of my valve using the straight air, the pressure in each brake .cyl-

' inderwill be the same, whether,thebrake cylinder piston is set to travel five inches or ten for the reasonthat the overcharge mentioned, the of my air pressure applied at the engine is distributed equally through my valve to the brake cylinders. This-prevents toa large extent, the parting or breakingin two of the train, as is now very often the case with the present system of automatic air. 7 As has been explained abovein order to set the brakes with my attachment, the enhe reduces the train line pressure. It will be seen that he can set the brakes either the same handle oftlie brake valve now used on the engine as he may see The by-pass 8 is arranged. n the auxiliary reservoir. air pressure. coming through port 5 to be equalized on both sides of the weighted piston valve 4 when it is seatedon port? and passage 18. This reduces the weight of the valve sothat it .Will

.Having now described invention, what- I. claim as new and desire to secure by Letters Patent isj:-

- with straight or automatic air by the use'of v casing l for "the purpose of allowing the I 1 In an airbrake system, a fluid pressure 1 valve mechanism for air brakes comprising a casing. provided with a valve chamber, av

weighted valve subject to train pipe and auxiliary reservoir air pressure n said chamber for controllingthe flow of train pipe air pressureto the.brake cylinder,,a

passage from said valve chamber to the brake cylinder. provided withexhaust'port, a piston valve in said passage provided with a throughport operatedbyytheflow of air pressure to the brake cylinder to. close said exhaustportand by gravity to open said exhaust port as the air pressure. equalizes through said through port.

2. In an air brake system,-a fluid pressure valve mechanismfor air brakes comprising a casing provided with a main valve chamber, a weighted valve disposed in said chamber, packing rings for said valve, a pipe for V establishing communication between said main valve chamberand the auxiliary. reservoir, a bypass in the Wall of the cask ing around said valve when the latter is in its lower position, a seepage groove in the wall of said casing'and connectingwiththe upper end of the said by-pass, a ,pipe for connecting one end of said valve casing with a supply of-compressed air, a passage .leadingfrom said pipe normally closed by said weighted valve and adapted'to .be 1111- covered by an overchargeof .air pressure in vthepassage, anoutlet pipe establishingcommunication with the brake cylinder, means for establishing communioation' between said main valve chamber and said outlet pipe, said means comprising a piston disposed Within a bore in said valve casing, a passage connecting saidmain valve casing with said bore, a passagearranged to be 1111-. covered by the movement of said piston valve for connecting said bore With said outlet pipe, an exhaust port normally uncovered and adapted to be covered when. the piston valve uncovers the passage between the interior of the bore and the outlet pipe,

Copies of this patent may be obtained for five cents each, by addressing the Commissioner of Patents,

said exhaust passage being uncovered by the movement of said piston valve to normalisposition, a screw plug at the lower end and a projection in the casing at the upper end its return to normal position.

HIRAM A. HATFIELD.

lVitnesses: I

JOHN A. ADAMS, WILLIAM Q. COLEMAN.

Washington, D. 0; 

